Test results on 60 MeV proton beam at CYCLONE - UCL Performed on CAEN HV prototype module A June 2001 Introduction
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1 Test results on 60 MeV proton beam at CYCLONE - UCL Performed on CAEN HV prototype module A June 2001 (M. De Giorgi, M. Verlato INFN Padova, G. Passuello CAEN spa) Introduction The test performed on a A877 module on 25 Oct ) at 60 MeV proton beam at CYCLONE - UCL put in evidence that the Control, Monitoring and Communication systems worked properly while being irradiated with an integrated fluence of 5*10 10 n/cm 2. At the same time the two solutions of high voltage regulators based respectively on a DC-DC voltage multiplier and on a npn HV transistor passed positively the test. The solution based on the IGBT device failed since the start of the test, proving to be unsuitable for the CMS Barrel Muon HV system. As the solution based on the npn HV transistor allowed for marginal changes in the module structure, a full module has been built based on this solution. Following the recommendations in 2), a test with a 60 MeV protons beam has been set up at the CYCLONE machine in UCL. With reference to the same document the TID at the level of the balconies (MB4), where the high voltage regulating modules will be located, is estimated to be ~40 Rads referred to 10 years (5 x 10 7 sec) of CMS operation at full luminosity. TID and displacement damages are considered negligible 3) given the dose and the particle fluence well below the critical 3*10 11 level, also for the NPN transistors. SEEs are considered for particle energies above 20MeV 4), with a total particle fluence about 10 9 /cm 2 at the barrel balconies' level, in the cavern. All the electronics located on the balconies is neither required nor designed to be rad hard, on the other side a fluence of /cm 2 60 MeV protons carries a TID of 14 krads 1), which is about 3 orders of magnitude higher than the dose foreseen in the CMS-BMU environment. In order to limit TID to an affordable level, a target integrated fluence of ~5*10 10 p/cm 2 (TID 7kRads) has been chosen for the test, compromising between safety factor (~50) in flux and an affordable TID. The layout of the new prototype is essentially the same as it was in the first full prototype 1). The npn HV transistors used as regulating elements are the BUH2M20AP by ST. 1
2 Set Up Fig.2 shows the channels layout: the lower portion allocates the Anode circuits, while the higher portion allocates the Strips and Cathodes. As the beam diameter was about 9 cm, the irradiation of the module had to be performed in several steps, so to allow for each channel to receive the foreseen fluence. In order not to exceed the foreseen maximum TID it was decided to use a collimator. The window was dimensioned in such a way that the sensitive regulation circuitry of two adjacent Anodes or one Strip and one Cathode of the same Macrochannel were fully covered in each irradiation step, as shown in fig. 1. In the case of Strip and Cathode also the local Monitor circuitry was included, while for the Anodes a part of it exceeded the collimator window. Anyway all the monitor circuitry was already successfully checked in a previous test 1). With reference to fig.2, the channels were irradiated in 12 steps (I ~XII); the CPU board was also irradiated in two steps (β,γ) and, just for cross-check, the local Monitoring circuitry exceeding the collimator window of Anodes 2-3 was also irradiated in an additional step (α). The basic scheme of one regulation cell is shown in fig 3a and 3b respectively for a positive and a negative channel. Each step ranged to an actual fluence of 5*10 10 n/cm 2. The test was performed without any load on the channels and with output settings near the off condition: Anodes +200 V Strips +100 V Cathodes V representing the heaviest working conditions for the series regulating devices. The settings of each solution were not changed during the relative test period. The time period allowed for the test was 6-7 hours. The useful beam diameter was about 9 cm and the flux was set to ~ 5*10 7 /cm 2 *s. Before the start of irradiation, the module was switched on to check various initial conditions: channels offsets with only LV on Test +200V, +100V, -100V nominal output +3800V, +1900V, -1900V The voltage, current and status of the channels were recorded for reference. Examples of voltage and current diagrams of Macrochannel 2 are shown in fig.4, fig.5 and fig.6 for the three conditions respectively. The irradiation of the channels took place on 27 June 2001 from 15:30 to 21:02 (I ~XII), the rest was carried on the day after (α,β,γ) from 15:45 to 16:57. The status and parameters of the A877 CPU controller were automatically refreshed every 1s by the remote supervisor CPU residing in the A876 module, while the A877 internal registers were refreshed every 250ms by the on-board CPU controller, this feature of the modules dealing transparently with the SEU category. Channel currents, voltages and status were automatically filed every 1 second, and plots displayed on line, to monitor the circuits for single event effects. Examples of voltage and current diagrams during the test are reported in fig.7 and fig. 8 for step II, and in fig9 and fig.10 for step XI. Fig.11, fig.12 and fig.13 show the voltage and current diagrams of Macrochannel 2 (A20,A21,S2,C2) during steps α,β,γ. In fig.14, fig. 15 and fig. 16 are shown as examples, the voltage and current diagrams for Macrochannel 2, 7 and 11 during the post-irradiation check at nominal votages and load.. 2
3 Results All along the test no SEE of any kind was detected. Only a transitory increase of Strip currents to ~100nA was seen during irradiation, that promptly dropped to the previous value as the beam went off. Immediately after irradiation the module has been checked at full voltage outputs under load: Anodes: 1.0 GΩ Strips: 0.5 GΩ Cathodes: 0.2 GΩ Showing full consistency of readings. The test was performed in three steps: in the first step were loaded MC0 MC3, in the second MC4 MC7, in the third MC8 MC11. A long term test was carried on the module a few weeks after irradiation, showing no deterioration in stability and performance. MTBF evaluation Single Event Effects of a non repairable type are the ones that can strongly affect the reliability and efficiency of a large and distributed system like the HV power supply tree of the CMS BMU drift tube detector. The evaluation of the mean-time-before failure parameter of such a system depends by the number of failures occurred during the test, extrapolated to the actual consistency of the final system and its foreseen lifetime. The foreseen neutron fluence above 20 MeV in 10 calendar years of LHC full luminosity operation, in the region where the HV modules will be lodged, is 10 9 /cm 2 over 5*10 7 sec. As the integrated fluence in this test was 5*10 10 p/cm 2, the full module ran the equivalent of 2.5*10 9 sec. Being the estimated LHC duty cycle 1/6, the module ran for an equivalent of 477 calendar years, or 79.4 years of continuous LHC operation. However, the total consistency of the HV system will be of 250 modules, while only one was subject to the test. The scale factor with respect to the whole system is then 250. Given the nature of SEEs, a reasonable model to apply is the exponential model 5) for which a constant parameter of Failure Rate can be defined. Having measured 0 SEEs, the method gives a lower limit for the MTBF of the tested devices with a 90% confidence level: MTBF t1/1 = T 1/1 / -ln(0.1) = 79.4*0.434 y = years of continuous operation MTBF t1/6 = T 1/6 / -ln(0.1) = 477*0.434 y = 207 calendar years Scaling to the whole system the lower limit of MTBF becomes: MTBF s1/1 = MTBF t1/1 / 250 = 50.3 days of continuous operation MTBF s1/6 = MTBF t1/6 / 250 = 302 days of continuous operation This figure, taking into account the limited accessibility to the balconies, will grant a sufficient reliability of the HV system with respect to non-recoverable SEEs. Test results confirm those of the previous test 1) indicating that the bipolar transistors show a decrease in the collector reverse currents. This modification can in principle be induced both by TID and displacement, but the displacement is still negligible 3) at the fluence of 5X10 10 p/cm 2 so the TID (~7krad) has to be considered the main responsible of this degradation, which will not happen in the balconies environment. 3
4 As the range of operating currents of the regulating cells is < 200 µa, while the driving circuits can feed much higher base currents, the implied reduction in the β does not affect anyway the functionality of the overall circuit. References 1) Test results of Wide Spectrum Neutron beam Test at UCL ) A global radiation test plan for CMS electronics in HCAL, Muons and Experimental Hall 3) Radiation effects in the electronics for CMS 4) Optimisation of the CMS forward shielding CMS NOTE 2000/ ) Engineering Statistics Handbook Acknowledgments We want to acknowledge the management of Centre de Recherches du Cyclotron of UCL Belgium, for allowing access to the Cyclone beams and infrastructure in CRC at a nominal cost in the frame of a collaboration with the CERN RD49/COTS project. Guy Berger for the useful discussions and for the collaboration during the test. Federico Faccio of RD49/COTS project, for his efforts in putting into efficient operation this collaboration, and for his constant help all along the test. 4
5 Positioning of collimator windows with respect to sensitive components of HV channels C0 S0 C1 S1 A00 A01 A10 A11 Fig.1: Macrochannels 0 and 1 location relative to collimator window positions 5
6 Communication LV in -2kV in +4kV in LV reg. Monitor CPU γ β A00 C0 A01 S0 A10 I C1 XII A11 S1 A20 C2 A21 S2 α A30 II C3 XI A31 S3 A40 C4 A41 S4 A50 III C5 X A51 S5 A60 C6 A61 S6 A70 IV C7 IX A71 S7 A80 C8 A81 S8 A90 V C9 VIII A91 S9 A100 C10 A101 S10 A110 VI C11 VII A111 S11 CH outputs LOAD Fig.2: Module layout and steps of irradiation 6
7 npn transistor VDR 6.8k 220k OUT 22k 22k 100M 2kV - + primary voltage to other transistors in same channel + - rectifier ~ ~ C D Controlled Generator on/off + - Vset fig. 3a S channel with HV Transistor regulator 7
8 VDR 6.8k 220k npn transistor OUT 22k 22k 100M 2kV - primary voltage - + rectifier ~ ~ to other transistors in same channel C D Controlled Generator on/off + - Vset fig. 3b C channel with HV Transistor regulator 8
9 Fig. 4: Channels offsets with only LV on 9
10 Fig. 5: current offsets at test voltages 10
11 Fig. 6: current offsets at nominal voltages 11
12 Fig. 7: MCH2 currents at test voltages Step II 12
13 Fig. 8: MCH3 currents at test voltages Step II 13
14 Fig. 9: MCH2 currents at test voltages Step XI 14
15 Fig. 10: MCH3 currents at test voltages Step XI 15
16 Fig. 11: MCH2 currents at test voltages Step α 16
17 Fig. 12: MCH2 currents at test voltages Step β 17
18 Fig. 13: MCH2 currents at test voltages Step γ 18
19 Fig. 14: MCH2 currents in post-irradiation test at full scale voltages and load 19
20 Fig. 15: MCH7 currents in post-irradiation test at full scale voltages and load 20
21 Fig. 16: MCH11 currents in post-irradiation test at full scale voltages and load 21
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